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US5010815A - Doctor device - Google Patents

Doctor device Download PDF

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Publication number
US5010815A
US5010815A US07/290,152 US29015288A US5010815A US 5010815 A US5010815 A US 5010815A US 29015288 A US29015288 A US 29015288A US 5010815 A US5010815 A US 5010815A
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US
United States
Prior art keywords
doctor
blade
mount
slot
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/290,152
Inventor
Norbert Weisbrod
Norbert Kobler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Albert Frankenthal AG
Original Assignee
Albert Frankenthal AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Albert Frankenthal AG filed Critical Albert Frankenthal AG
Assigned to ALBERT-FRANKENTHAL AG reassignment ALBERT-FRANKENTHAL AG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KOBLER, NORBERT, WEISBROD, NORBERT
Application granted granted Critical
Publication of US5010815A publication Critical patent/US5010815A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the invention relates to a doctor unit for a printing press with at least one doctor blade arranged to be carried on a doctor mount;
  • one object of the invention is to so imProve a doctor arrangement of the initiallY described type using simple and cheap means that reliable operation is ensured.
  • a further object of the invention is to avoid extreme loading or wear of the doctor blade.
  • the doctor blade is able to be loosely mounted in a slot therefor in the doctor mount.
  • the clearance width of the blade slot which preferably extends the full length of the blade mount, has an oversize of 3/100 to 4/100 mm, i.e. it exceeds the thickness of the blade by this amount. This feature ensures reliable support of the doctor blade despite the intended possibility of expansion.
  • sealing bars are arranged so as to give way in the longitudinal direction of the doctor blades and are preferably provided with spring means in order to urge them against the blades. This ensures that in the case of expansion of the doctor blades the sealing bars are able to give way so that in this case as well it is possible to avoid corrugation of the doctor blades.
  • FIG. 1 is a diagrammatic view of an offset litho press inking unit ensuring a short ink path from the fountain to the surface of the plate cylinder.
  • FIG. 2 is a section through a doctor with an ink chamber using two loosely mounted doctor blades.
  • the inking unit of FIG. 1 which ensures a short path of the ink from the ink chamber to the plate cylinder, and is thus referred to as a short inking unit, comprises a rubber coated form roIl 2 running on the plate cylinder 1.
  • the form roll 2 is supplied with ink bY a pitted roll 3 and with dampening liquid by a dampening unit 4.
  • the periphery of the pitted roll 3, which may have a ceramic coating is provided with pits 5, shown on an exaggerated scale, and lands 6 delimiting the pits from each other.
  • the pits 5 are filled with ink.
  • the lands 6 are wiped clean by the doctor blade.
  • the supply of ink to the pitted roll 3 and the wiping of the lands 6 is carried out in the present case bY an ink chamber doctor generally referenced 7 in FIG. 1.
  • This doctor comprises, as will be seen from FIG. 2, a bar-like doctor mount g, carried on carriers 8 secured to the frame of the press and two doctor blades II and 12 which are carried on the mount 9 and are mutually offset from each other in the direction of rotation of the pitted roll.
  • the doctor blades define an ink receiving chamber 13 between them which is fed with offset litho ink by a pump 16.
  • the rear blade 11 in the direction of rotation of the Pitted roll 3 acts as the front doctor which has a gutter 14 under it.
  • the other doctor blade 12 acts as the chamber closing blade. Both the doctor blades are set at a negative angle to the roll 3 in the illustrated example of the invention.
  • the mount 9 is provided with blade receiving slots 15 extending along its full length.
  • the doctor mount 9 is provided at its sides with respective stepped recesses which are respectivelY shut off by a rail 10, carried on the doctor mount 9, so that a groove-like blade receiving slot 15 is defined.
  • the clearance width of the blade slot 15 has an oversize of 3/100 to 4/100 mm.
  • the doctor blades 11 and 12 also extend along the full length of the doctor mount 9. At the ends of the doctor mount 9 the ink receiving chamber 3 is delimited by sealing bars 43 resting on the periphery of the pitted roll 3 and the ends of the doctor blades 11 and 12.
  • the sealing bars 43 are formedly a piece of sheet metal whose sides are taken up in guides 46 formed on the doctor mount 9.
  • the clearance width of the guides 46 is made with such an oversize in relation to the thickness of the sealing bars 43 in the longitudinal direction of the doctor blades 11 and 12 that when the doctor blades 11 and 12 expand it is possible for the sealing bars to give way to a suitable extent.
  • the sealing bars 43 are urged resiliently against the ends of the doctor blades 11 and 12, for which purpose the sealing bars, where they engage the ends of the doctor blades, have finger-like supports 44 fitting behind them, which resiliently bear against the doctor mount 9 in the length direction of the doctor blades 11 and 12, this being indicated at 45.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

In the context of an ink doctor arrangement with at least one doctor blade which is arranged to be carried on a doctor blade mount more reliable operation with less wear and is made possible by arranging the blade loosely in a slot in the said mount.

Description

BACKGROUND OF THE INVENTION
The invention relates to a doctor unit for a printing press with at least one doctor blade arranged to be carried on a doctor mount;
In the prior art the doctor blade is firmly gripped in the mount. The consequence of such a method of fixing is that the gripped part of the blade, which during operation is heated to a considerable extent is not able to expand laterallY. and this causes part of the blade which is not gripped to become corrugated where it engages the cYlinder to be wiped bY the blade. In order to nevertheless avoid an uneven engagement of the doctor blade on the cylinder to be Wiped it has thus been necessary to use a substantial force to apply the blade to the cylinder and this led to rapid wear of the doctor blade something that in turn led to the necessitY cf frequent resetting and replacement of the blade. Known arrangements accordingly are not sufficiently simple to operate and are insufficiently economic. The above disadvantages make themselves particularly felt in connection with offset lithe ink systems, because the high ink viscosity leads to a very pronounced heating of the doctor
SHORT SUMMARY OF THE INVENTION
Taking this state of the art as its starting point, one object of the invention is to so imProve a doctor arrangement of the initiallY described type using simple and cheap means that reliable operation is ensured.
A further object of the invention is to avoid extreme loading or wear of the doctor blade.
In order to achieve these or other aims in the invention the doctor blade is able to be loosely mounted in a slot therefor in the doctor mount.
This ensures on the on a hand that the doctor blade or blades is or are able to expand in the lateral direction sc that even if they are applied to the cylinder with a low force so as to ensure low gear, there is a reliable engagement of the blade on the cylinder to be wiped. This is particularly advantageous in those cases in which high viscosity inks, such as lithe inks, are being hand-ed which maY lead to a considerable heating of the doctor blade or the doctor blades.
In this respect it is an advantage if the clearance width of the blade slot, which preferably extends the full length of the blade mount, has an oversize of 3/100 to 4/100 mm, i.e. it exceeds the thickness of the blade by this amount. This feature ensures reliable support of the doctor blade despite the intended possibility of expansion.
It is an advantage if the blade slot is delimited by a rail carried on a stepped recess in the doctor blade mount. This feature ensures simple production of the blade slot.
In the case of a doctor with an ink chamber defined by two doctor blades and an ink receiving space walled off at the ends by sealing bars it is an advantage if the sealing bars are arranged so as to give way in the longitudinal direction of the doctor blades and are preferably provided with spring means in order to urge them against the blades. This ensures that in the case of expansion of the doctor blades the sealing bars are able to give way so that in this case as well it is possible to avoid corrugation of the doctor blades.
Further advantageous features of the invention will be seen from the claims and from the following account of one working example of the invention.
LIST OF THE FIGURES OF THE DRAWING
FIG. 1 is a diagrammatic view of an offset litho press inking unit ensuring a short ink path from the fountain to the surface of the plate cylinder.
FIG. 2 is a section through a doctor with an ink chamber using two loosely mounted doctor blades.
DETAILED DESCRIPTION OF WORKING EMBODIMENT OF THE INVENTION
The inking unit of FIG. 1, which ensures a short path of the ink from the ink chamber to the plate cylinder, and is thus referred to as a short inking unit, comprises a rubber coated form roIl 2 running on the plate cylinder 1. The form roll 2 is supplied with ink bY a pitted roll 3 and with dampening liquid by a dampening unit 4. The periphery of the pitted roll 3, which may have a ceramic coating is provided with pits 5, shown on an exaggerated scale, and lands 6 delimiting the pits from each other. The pits 5 are filled with ink. The lands 6 are wiped clean by the doctor blade.
The supply of ink to the pitted roll 3 and the wiping of the lands 6 is carried out in the present case bY an ink chamber doctor generally referenced 7 in FIG. 1. This doctor comprises, as will be seen from FIG. 2, a bar-like doctor mount g, carried on carriers 8 secured to the frame of the press and two doctor blades II and 12 which are carried on the mount 9 and are mutually offset from each other in the direction of rotation of the pitted roll. The doctor blades define an ink receiving chamber 13 between them which is fed with offset litho ink by a pump 16. The rear blade 11 in the direction of rotation of the Pitted roll 3 acts as the front doctor which has a gutter 14 under it. The other doctor blade 12 acts as the chamber closing blade. Both the doctor blades are set at a negative angle to the roll 3 in the illustrated example of the invention.
The doctor blades 11 and 12. Which oWing to the high viscosity of the offset ink are considerably heated, are loosely mounted in the doctor mount 9, that is to saY without anY clamping effect. The mount 9 is provided with blade receiving slots 15 extending along its full length. For this purpose the doctor mount 9 is provided at its sides with respective stepped recesses which are respectivelY shut off by a rail 10, carried on the doctor mount 9, so that a groove-like blade receiving slot 15 is defined. The clearance width of the blade slot 15 has an oversize of 3/100 to 4/100 mm.
The doctor blades 11 and 12 also extend along the full length of the doctor mount 9. At the ends of the doctor mount 9 the ink receiving chamber 3 is delimited by sealing bars 43 resting on the periphery of the pitted roll 3 and the ends of the doctor blades 11 and 12. The sealing bars 43 are formedly a piece of sheet metal whose sides are taken up in guides 46 formed on the doctor mount 9. The clearance width of the guides 46 is made with such an oversize in relation to the thickness of the sealing bars 43 in the longitudinal direction of the doctor blades 11 and 12 that when the doctor blades 11 and 12 expand it is possible for the sealing bars to give way to a suitable extent. The sealing bars 43 are urged resiliently against the ends of the doctor blades 11 and 12, for which purpose the sealing bars, where they engage the ends of the doctor blades, have finger-like supports 44 fitting behind them, which resiliently bear against the doctor mount 9 in the length direction of the doctor blades 11 and 12, this being indicated at 45.

Claims (4)

We claim:
1. A doctor arrangement for wiping excess ink from a pitted cylinder forming a part of an off set press inking unit, comprising:
at least one doctor blade; and,
a blade mount having a slot extending along the length of said blade mount in which said blade is loosely fitted, said slot having a clearance width with an oversize with respect to the thickness of said doctor blade, the oversize amounting to 3/100 to 4/100 mm, said arrangement being entirely devoid of any other structure which tends to grip said doctor blade in said slot.
2. The doctor arrangement as claimed in claim 1 wherein the blade slot in the blade mount is delimited by a rail arranged to be carried in a stepped recess in the blade mount.
3. The doctor arrangement as claimed in claim 1 comprising at least two of said doctor blades of which at least one of said doctor blades to the rear, in terms of the direction of rotation of the cylinder, is set loosely in a blade receiving slot in said blade mount and is set at a negative angle to the cylinder.
4. The doctor arrangement as claimed in claim 3 comprising sealing bars engaging the ends of said doctor blades in yielding and resilient manner.
US07/290,152 1988-01-09 1988-12-27 Doctor device Expired - Fee Related US5010815A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3800411A DE3800411A1 (en) 1988-01-09 1988-01-09 INK
DE3800411 1988-01-09

Publications (1)

Publication Number Publication Date
US5010815A true US5010815A (en) 1991-04-30

Family

ID=6344988

Family Applications (2)

Application Number Title Priority Date Filing Date
US07/290,152 Expired - Fee Related US5010815A (en) 1988-01-09 1988-12-27 Doctor device
US07/659,459 Expired - Fee Related US5072669A (en) 1988-01-09 1991-02-21 Inking unit

Family Applications After (1)

Application Number Title Priority Date Filing Date
US07/659,459 Expired - Fee Related US5072669A (en) 1988-01-09 1991-02-21 Inking unit

Country Status (4)

Country Link
US (2) US5010815A (en)
EP (2) EP0324139B1 (en)
JP (2) JPH01222959A (en)
DE (3) DE3800411A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6655280B2 (en) 2001-01-12 2003-12-02 Heidelberger Druckmaschinen Ag Inking unit in a printing machine having a chambered doctor blade and multiple inking zones
US20050201781A1 (en) * 2004-03-12 2005-09-15 Macmillan David S. Toner regulating system having toner regulating member with metallic coating on flexible substrate
US20060024093A1 (en) * 2004-07-27 2006-02-02 Askren Benjamin A Electrophotographic toner regulating member with induced strain outside elastic response region

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3938447A1 (en) * 1989-11-18 1991-05-23 Roland Man Druckmasch INKWORK WITH ZONAL DOSAGE OF COLOR QUANTITY
DE4012825A1 (en) * 1990-04-23 1991-10-24 Koenig & Bauer Ag CHAMBER Squeegee
US5213037A (en) * 1990-11-02 1993-05-25 The Procter & Gamble Company Apparatus for applying ink to a substrate
DE4117390C2 (en) * 1991-05-28 2003-11-06 Koenig & Bauer Ag Squeegee bar for an inking unit of a rotary printing press
DE4119338A1 (en) * 1991-06-12 1992-12-17 Koenig & Bauer Ag SHORT INKING MACHINE FOR AN OFFSET ROLL ROTARY PRINTING MACHINE
FR2689451B1 (en) * 1992-04-03 1997-01-17 Komori Chambon INKING DEVICE FOR A HELIOGRAPHIC PRINTING APPARATUS.
DE4401299C2 (en) * 1994-01-18 1997-04-30 Roland Man Druckmasch Device for inking an anilox roller of a rotary printing press
US5495800A (en) * 1995-03-29 1996-03-05 Cavanagh Corporation Enhanced application printing ink hand proofing device
US5836519A (en) * 1996-10-03 1998-11-17 Brown; Robert S. Portable wheeled spraying apparatus having an adjustable handle
DE29617829U1 (en) * 1996-10-14 1997-01-23 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Application device for applying a coating medium
US6119595A (en) * 1997-10-06 2000-09-19 R. J. Reynolds Tobacco Company Gravure printing press with encapsulated ink applicator and method
US6076463A (en) * 1998-03-13 2000-06-20 Heidelberger Druckmaschinen Ag Ink metering device and method of metering ink
CH693305A5 (en) * 1999-03-05 2003-05-30 Bobst Sa Removable inking device for a flexographic printing machine.
US6378426B1 (en) 2000-05-12 2002-04-30 Harper Companies International Manually operable proofer for producing sample test printings of inks and coatings
DE102005040929B4 (en) * 2005-07-18 2009-06-04 Windmöller & Hölscher Kg Ink chamber doctor blade
JP5391559B2 (en) * 2008-03-04 2014-01-15 凸版印刷株式会社 Printing machine and method for producing printed matter using the same
EP3399099A1 (en) * 2017-05-03 2018-11-07 Oradoc S.r.l. Rigid and flexible doctor blade holder and system comprising a cylinder and a doctor blade holder
GB2576566B (en) * 2018-08-24 2022-12-14 Edward Rogerson Mark Improved wiper blade for printer roller

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB693187A (en) * 1950-12-22 1953-06-24 Harold Eric Baliol Scott Improvements in doctors for paper and like machines
GB800607A (en) * 1956-01-13 1958-08-27 Harold Eric Baliol Scott Improvements in or relating to doctors for papermaking and other machines
FR1164098A (en) * 1956-01-13 1958-10-06 Vickerys Ltd Improved squeegee for papermaking and similar machines
US3986453A (en) * 1974-04-08 1976-10-19 Ahlen & Akerlunds Forlags Ab Device for stripping excess ink from a rotating printing roll in rotogravure presses
DE2538908A1 (en) * 1975-09-02 1977-03-10 Kaspar Walter Maschinenfabrik Doctor blade for ink roller printing - is spring biased against roller between clamped support plates
EP0110081A1 (en) * 1982-12-02 1984-06-13 Rockwell International Corporation Ink injector rail

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US2018193A (en) * 1931-08-27 1935-10-22 Goss Printing Press Co Ltd Inking mechanism and method
US2177656A (en) * 1933-06-30 1939-10-31 Harris Seybold Potter Co Gravure printing press
US2151969A (en) * 1938-06-09 1939-03-28 Standard Process Corp Inking apparatus and method
US3339485A (en) * 1964-06-15 1967-09-05 Bonnierfoeretagen Ab Adjustable ink supply device in rotary printing presses
GB1230020A (en) * 1967-06-30 1971-04-28
US3759175A (en) * 1970-03-10 1973-09-18 Strachan & Henshaw Ltd Dampening apparatus with rotor for projecting spray
DE2228685C3 (en) * 1972-06-13 1978-04-06 Escher Wyss Gmbh, 7980 Ravensburg Coating device
AT345240B (en) * 1973-02-01 1978-09-11 Zimmer Peter SQUEEGEE DEVICE FOR PRINTING TRACKS
US4009657A (en) * 1975-02-25 1977-03-01 Scott Paper Company Apparatus for applying fluid to an intaglio roll for transfer to a soft, absorbent fibrous web
US4455938A (en) * 1979-05-22 1984-06-26 Graph Tech Inc. Dampening apparatus for lithographic press
DE3043234A1 (en) * 1980-11-15 1982-07-01 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach INKBOX FOR A PRINTING MACHINE
JPS5962152A (en) * 1982-09-30 1984-04-09 Osaka Yomiuri Shinbunsha:Kk Ink supplier for rotary press printer
CH663362A5 (en) * 1984-01-07 1987-12-15 Jagenberg Ag DEVICE FOR COATING MATERIAL SHEETS RUNNING ON A SUPPORT ROLLER WITH ADJUSTABLE APPLICATION THICKNESS.
FI71081C (en) * 1984-05-11 1986-11-24 Waertsilae Oy Ab coating method
US4590855A (en) * 1984-06-18 1986-05-27 Printco Industries, Ltd. Reverse angle doctor blade assembly with stationary end seal
DE3427909C2 (en) * 1984-07-28 1987-02-12 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Paint dosing device
US4625643A (en) * 1984-08-09 1986-12-02 Davis William F Ink dispensing means
US4802928A (en) * 1984-08-13 1989-02-07 Thermo Electron-Web Systems, Inc. Doctoring apparatus and method employing prestressed doctor blade
DE3505598C2 (en) * 1984-10-30 1986-08-14 Windmöller & Hölscher, 4540 Lengerich Rinse inking unit with divided chamber doctor blade
EP0199520A3 (en) * 1985-04-19 1989-02-08 Vickers Plc Gravure printing press and method of manufacturing the same
EP0278255A3 (en) * 1987-02-04 1990-09-12 General Electric Company Solvent-resistant, compatible polyphenylene ether-linear polyester blends
DE3704433A1 (en) * 1987-02-12 1988-08-25 Frankenthal Ag Albert SHORT COLOR PLANT

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB693187A (en) * 1950-12-22 1953-06-24 Harold Eric Baliol Scott Improvements in doctors for paper and like machines
GB800607A (en) * 1956-01-13 1958-08-27 Harold Eric Baliol Scott Improvements in or relating to doctors for papermaking and other machines
FR1164098A (en) * 1956-01-13 1958-10-06 Vickerys Ltd Improved squeegee for papermaking and similar machines
US3986453A (en) * 1974-04-08 1976-10-19 Ahlen & Akerlunds Forlags Ab Device for stripping excess ink from a rotating printing roll in rotogravure presses
DE2538908A1 (en) * 1975-09-02 1977-03-10 Kaspar Walter Maschinenfabrik Doctor blade for ink roller printing - is spring biased against roller between clamped support plates
EP0110081A1 (en) * 1982-12-02 1984-06-13 Rockwell International Corporation Ink injector rail

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6655280B2 (en) 2001-01-12 2003-12-02 Heidelberger Druckmaschinen Ag Inking unit in a printing machine having a chambered doctor blade and multiple inking zones
US20050201781A1 (en) * 2004-03-12 2005-09-15 Macmillan David S. Toner regulating system having toner regulating member with metallic coating on flexible substrate
US7013104B2 (en) 2004-03-12 2006-03-14 Lexmark International, Inc. Toner regulating system having toner regulating member with metallic coating on flexible substrate
US20060024093A1 (en) * 2004-07-27 2006-02-02 Askren Benjamin A Electrophotographic toner regulating member with induced strain outside elastic response region
US7236729B2 (en) 2004-07-27 2007-06-26 Lexmark International, Inc. Electrophotographic toner regulating member with induced strain outside elastic response region

Also Published As

Publication number Publication date
DE3800411C2 (en) 1990-03-29
DE3872693D1 (en) 1992-08-13
JPH01225555A (en) 1989-09-08
JPH07102687B2 (en) 1995-11-08
JPH01222959A (en) 1989-09-06
EP0324141A3 (en) 1990-08-22
EP0324139A3 (en) 1990-08-08
DE3800411A1 (en) 1989-07-20
DE3872692D1 (en) 1992-08-13
US5072669A (en) 1991-12-17
EP0324139A2 (en) 1989-07-19
EP0324141B1 (en) 1992-07-08
EP0324141A2 (en) 1989-07-19
EP0324139B1 (en) 1992-07-08

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